I agree, he should be proud of that... So, why not advertise it?
I think that Muclair's dual citizenship status will have an impact on some voters. In fact, I believe that it will be many voters will take notice.
Considering that party's membership has gone up since he's been in office, and he's the #1 candidate to win this thing, I highly doubt voters even give a damn.
Both my parents were American and though I was born in Canada, I could have had dual citizenship but I didn't want it. A couple of my siblings opted for dual citizenship and I don't think it made much difference in their lives.
Then he's got nothing to worry about then.